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manual abstract
They are the highest performance low frequency drivers that Altec produces. When the ultimate in sound quality, efficiency, and response is needed, the 515-G Series is the answer. In-depth research into the properties of low frequency horns and vented horns has produced three drivers which are optimum for hom applications. When coupled with an appropriate horn, the 515-G Series loudspeakers provide the best possible combination of wide response, high efficiency, low distortion, and directivity control. The 515-G Series loudspeakers incorporate Altec's largest magnet structure, an edgewound aluminium flatwire voice coil, a light cone assembly, and a low distortion cloth suspension. The 515-8G and 515-16G carry on the Altec Lansing 515 tradition. The 515-8G provides extended bass response and extremely high linearity for optimum performance in vented hom enclosures. The 515-16G is intended for applications similar to those for the 515-8G, but where 16 ohm impedance and increased sensitivity is needed, as in dual loudspeaker enclosures such as the Altec 210/211 and 817A vented horns. Both loudspeakers are constructed of materials similar to 515’s of earlier years to produce the sound made popular in theater and studio applications. The 515-8GHP is the most efficient loudspeaker Altec has ever produced. This, coupled with high power handling, yields a speaker capable of very high sound pressure levels and good reliability. The hom-loaded design of the 515-G Series ensures that the 515-8GHP performs optimally in all vented hom enclosures. SPECIFICATIONS (continued) 515-8G 515-16G 515-8GHP Thiele/Small Parameters-Voice Coil DC Resistance (RE): Nominal Free-Air Resonance (fs): Total Q (Q^): Mechanical 0(0^): Electrical Q (QES): Equivalent Volume Compliance (VA5): Reference Efficiency (t|o): Peak Linear Displacement (XMAX): Peak Linear Volume Displacement (V„): Effective Piston Area of Driver Diaphragm (SD): 6.2 ohms 37 Hz 0.269 5.0 0.284 12.4 ft3 (351.1L) 6.0% 0.17 inches (0.43 cm) 22.4 in3 (367.1 cm3) 131.5 in2 (848.4 cm2) 11.3 ohms 37 Hz 0.215 5.0 0.225 12.2 ft3 (345.5 L) 7.5% 0.15 inches (0.38 cm) 19.7 in3 (322.8 cm3) 131.5 in2 (848.4 cm2) 5.6 ohms 37 Hz 0.187 4.5 0.195 12.1 ft3 (342.6 L) 8.6% 0.12 inches (0.31cm) 15.8 in3 (258.9 cm3) 131.5 in2 (848.4 cm2) Maximum Excursion Before Damage (Peak to Peak): 0.70 inches (1.8 cm) 0.70 inches (1.8 cm) 0.85 inches (2.2 cm) Voice Coil Winding Depth: 0.20 inches (0.51 cm) 0.25 inches (0.64 cm) 0.31 inches (0.79 cm) Magnetic Gap Depth: 0.47 inches (1.2 cm) 0.47 inches (1.2 cm) 0.47 inches (1.2 cm) Bl Factor (T-m): 16.4 25.1 19.1 Voice Coil Inductance: 0.58 mH 1.30 mH 0.68 mH Voice Coil Diameter: 3.0 inches (7.6 cm) 3.0 inches (7.6 cm) 3.0 inches (7.6 cm) Magnet Type: ferrite ferrite ferrite Magnet Weight: 132 oz. (3.74 kgs) 132 oz. (3.74 kgs) 132 oz. (3.74 kgs) Magnetic Flux Density: 15,000 gauss 15,000 gauss 15,000 gauss Voice Coil Type: edge-wound aluminum ribbon edge-wound aluminum ribbon edge-wound aluminum ribbon Frame: Die-cast aluminum Die-cast aluminum Die-cast aluminum Mounting Information-Baffle Opening Diameter: 14.1 inches (38.4 cm) 14.1 inches (38.4 cm) 14.1 inches (38.4 cm) Mounting Bolt Circle Diameter: 15.0 inches (44.0 cm) 15.0 inches (44.0 cm) 15.0 inches (44.0 cm) Loudspeaker Depth Rear Mounting: 6 7 inches (17.0 cm) 6.7 inches (17.0 cm) 6.7 inches (17.0 cm) Front Mounting: 5.9 inches (14.9 cm) 5.9 inches (14.9 cm) 5.9 inches (14.9 cm) Weight: 30 lbs. (13.6 kg) 30 lbs. (13.6 kg) 30 lbs. (13.6 kg) * AES power rating (measured Power = E2/R, using Pink Noise with a crest factor of 6 dB and a band-limit of 60 to 600 Hz). ** Low frequency limit is the 3 dB down point using the particular cabinet and the Thiele/Small parameters of the loudspeaker. *** Measured in the free-field at 4.0 feet (1.2 m) on axis with one watt (Power = E2/R) of pink noise band-limited from 100 to 1000 Hz. dB SPL dB SPL dB SPL dB SPL Frequency (Hz) Figure 1: Frequency Response and Impedance of 515-16G in 828G Enclosure Frequency (Hz) Figure 2: Frequency Response and Impedance of 515-16G in 816A Enclosure 8 ohms 20 50 100 200 500 1000 2000 5000 10000 20000 Frequency (Hz) Figure 3: Frequency Response and Impedance of Two 515-16G's in 817A Enclosure Ф Frequency (Hz) Figure 4: Frequency Response and Impedance of Two 515-16G‘s in 210A Enclosure m (A) Loudspeaker Diameter: 16.0 inches (40.6 cm). (D) (B) Bolt Circle Diameter: 15.0 inches (38.1 cm). (E) (C) Depth When Rear Mounted: 6.7 inches (17.0 cm). (F) Depth When Front Mounted: 5.9 inches (14.9 cm). Baffle Opening Diameter: 14.1 inches (35.9 cm). Bolt Hole Slots: 0.25 inch (0.6 cm) x 0.75 inch (2.0 cm); 8 slots spaced 45° apart. ARCHITECT'S AND ENGINEER'S SPECIFICATIONS The low frequency loudspeaker shall meet the following criteria. Power rating, up to_watts, measured E2/R, using a crest factorof 6 dB and band-limited from 60 to 600 Hz. Frequency response, uniform from_to 4000 Hz when u...